Electric motor.



PATBNTBD JUNE 23, 190,3-,`

W. V.l ASH. ELECTRIC MOTOR.

APPLICATION FILED JAN. 2, 190s.

INVENTOR Walter' V. Ash

BY A A ATTORNY WITN ESSES No. 731,333. PATENTBD JUNE z3, 1903. W. V. ASH.

ELECTRIC MOTOR.

APPLICATION FILED JAN. 3J 190s.

UNITED STATES Patented .fune 23, 1903.

VALTER V. ASH, OF VPERTH AMBOY, NEW JERSEY.

ELECTRIC MOTOR.

SPECIFICATON lforming part of Letters Patent No. 731,836, dated June23, 1903.

Application filed January 2,1903. Serial No. 137,521. (No model.)

To all whom, t may concern.'

Be it known that I, VALTER V. ASH, a citizenof the United States of America, and a resident of Perth Amboy, in the county of Middlesex and State of New Jersey, have invented certain new and useful Improvements in Electric Motors, of which the following is a specification.

This invention relates more especially to multipolar electric motors or apparatus of like general class having an armature rotating in a magnetic field between pole-pieces which are radially adjustable to vary the airspace between the armature and pole-pieces and thereby regulate the reluctance of the magnetic field for controlling the speed of the motor or apparatus.

The invention mainly comprises a simple and effective arrangement of an adjuster working by its inclined faces upon corresponding inclined walls or faces of the polepiece or its core, whereby movement of the adjuster will radially adjust the pole-piece relatively to the armature.

The invention also includes suitable means whereby all the pole-pieces may be adjusted uniformly and simultaneously and also includes preferred mechanism for effecting this simultaneous adjustment of the pole-pieces, together with various details of construction, all as hereinafter described and claimed.

Reference is made to the accompanying drawings, forming part of this specification, and in which- Figure 1 is a sectional side elevation of the principal portions of a multipolar motor embodying a preferred arrangement of my in` vention and with parts indicated by dotted lines and other parts broken away. Fig. 2 is a detail cross-sectional view taken on the line n; cc in Fig. 1. Fig. 3 is a transverse sectional view taken on the line y y in Fig. 1. Fig. 4 is adetail section taken on the line a' .e in Fig. 1. Fig. 5 is a side view of one of the pole-pieces, and Fig. 6 is a perspective view of the adj usterforone of the pole-pieces.

The numeral 1 indicates the main frame of the motor, which is made in general ring form and with suitable supporting-legs. In

this frame there are a number of preferably long radial openings 2, 1n which the cores 3 of a corresponding number of pole-pieces 4 y are adapted to move to assure radial adjustment of the pole-pieces relatively to an armature 5, journaled to rotate in the magnetic field of the pole-pieces. I show four polen pieces 4; but any desired number may be employed. The innermost thinner portions of the walls of the frame-openings 2 (or the inner parts of the cores 3 should these openings 2 be shortened) and also the armature may have any desired wire windings, as the special class of motor or apparatus may suggestor require. .The armature 5 is indicated by dotted lines in Fig. 1 of the drawings, which also shows the pole-piece'windings 6 in dotted lines.

When the pole-piece core has the preferred form shown in the drawings, it is provided with two slots 7 3, made, respectively, at its opposite sides. The main object in cutting these slots is to provide for most convenient formation on or in this preferred core of two diagonally-located inclined walls or surfaces, which here comprise the inner wall 9 of slot 7 and the outer wall 10 of slot 8. Opposing walls 1l 12 of the slots 7 8 are shown about square or at right angles to the length of the core and spaced from the opposing inclined walls 9 10 for a distance permitting free lateral movement of the adjuster device'13 during radial movement of the pole-piece bythe adjuster in manner presently explained.

Each adjuster 13 is preferably made with two parallel tongues 14 15, connected by a cross-head 16, as best shown in Figs. 2 and 6 of the drawings. The two outside halves or parts of the tongues 14 15 have uniform thickness to compel sliding of the adjuster without lost motion radially in two opposite lateral slots 17 18, made in the frame 1, near its perphery,ateachcore-receivingopeningZ. The inner half or part of the tongue 14 has at its inner face a lengthwise incline or bevel 19,

which worksclosely on the inner inclined wall 9 of the core-slot 7, and the inner half `or part of the other adjuster-tongue 15 has at its outer face a lengthwise bevel orincline 20, which is substantially parallel with the incline 19 and works closely on the outer inclined wall 10 of the other core-slot 8. The space between the adjuster-tongues 14 15 accommodates that portion of the frame between the bases of its slots 17 18. Any means IOO moving the adjuster laterally in opposite directions will, by action of its inclined faces 19 20 on the inclined walls 9 10 of the polepiece core-slots, impart radial movement to the core in the frame to adjust its pole-piece 4 nearer to or farther from the armature. At all adjustments of the pole-piece it will be held by the coacting inclined surfaces 9 19 and 10 2O Without radial slackness, and the pole-piece cannot be radially moved otherwise than by laterally moving the adjuster. As the inclines ot' the adjuster Work on the inclined walls of the pole-piece core to thus radially move the pole-piece, clearance is provided for the adjuster next the walls 11 12 of' the core-slots. Each of the pole-pieces may thus be radially and separately set by a corresponding laterally-movable adjuster; but an important part of my invention provides for adjusting all the pole-pieces simultaneously by moving their corresponding adjusters in unison. l may accomplish this in various ways; but a preferred method consists in cutting a screw-thread 2l on the crosshead 16 of each adjuster and fitting a revoluble screw-collar 22 on the threads 21 of all the adjusters,\vhe1ebythey,and consequently all the pole-pieces, will be automatically and simultaneously adjusted, so as to uniformly and accurately vary the air-space or distance between all the pole-pieces 4 and the armature 5, and thereby accurately regulate the reluctance of the magnetic circuit tc cause the motor to run at a higher or lower speed, the speed being increased as the pole-pieces are moved radially outward and decreased as they are moved inward.

Asuitable retaining-ring 23, held to the frame l by bolts 24, overlaps the collar 22 and prevents undue lateral play of the collar as it is turned to set the pole-pieces. This ring 23 is preferably connected to radial spokes 25, 1

which carry the armature-bearings at that side of the motor, and a like spoked ring 26, fastened to the frame 1 by bolts 27, supports the armature-bearings at the opposite side of the motor. Recesses 2S in the frame 1 provide for lateral movement of the threaded heads 16 of the adjacent adjuster devices. Although the screw-collar 22 should accurately move all the adjusters simultaneously, I now prefer to compensate for looseness of fit of the screw-threads ofthe collar and adjusters and compel like movement of all the pole-pieces by coupling all the adjusters 13 together by any suitable means, such as a ring 29, through which bolts or screws 30 pass into the heads 16 of the adjusters. This ring 29 also serves as an internal resistance to pressure on the adjusters or on the screw-collar during operation of the latter for adjusting the pole-pieces.

I claim as my'invention- 1. In an electric motor or like apparatus, the combination, with the frame, the armature, and a radially-adjustable pole-piece provided with inclined walls, of an adjuster having inclined faces acting on the inclined walls of the pole-piece and radially adjusting said pole-piece relatively tothe armature, substantially as described.

2. In an electric motor or like apparatus, the combination, with the frame, the armature, and a radially-adjustable pole-piece provided with lateral slots having inclined Walls, of an adjuster having inclined faces acting on the inclined walls of the pole-piece slots and radially adjusting said pole-piece relatively to the armature, substantially as described.

3. In a multipolar electric motor or like apparatus, the combination, with the frame, the armature, and a series of adjustable polepieces each provided with inclined walls, of a corresponding series of adjusters each having inclined faces acting on the inclined walls of the corresponding pole-piece and radially adjusting said pole-pieces relatively to the armature, substantially as described.

4. In a multipola r electric motor or like apparatus, the combination, with the frame, the armature, and a series of adjustable polepieces each provided with lateral slots having inclined walls, of a corresponding series of adjusters each having inclined faces acting cn the corresponding inclined walls ot` the pole-piece slots and radially adjusting said pole-pieces relatively to the armature, substantially as described.

5. In a multipolar electric motor or like apparatus, the combination, with the frame, the armature, and a series of pole-pieces radially movable in or on theframe, of a corresponding series of screw-threaded devices adapted to adj ust the pole-pieces, and a revoluble screwthreaded collar fitting the screw-threads on all the pole-piece-adjusting devices and simultaneously adjusting all the pole -pieces relatively to the armature.

6. In a multipolar electric motor or like apparatus, the combination, with the frame, the armature, and a series of pole-pieces radially movable in or on the frame, of a corresponding series of screw-threaded devices adapted to adjust the pole pieces, a revoluble screwthreaded collar fitting the screw-threads on all the pole-piece-adjusting devices 'and simultaneously adjusting all the pole-pieces relatively to the armature, and supplemental means coupling all of said adjusting devices together.

7. In a multipolar electric motor or like apparatus, the combination, with the frame, the armature, and a series of pole-pieces radially movable in or on the frame, of a corresponding series of screw-threaded devices adapted to adjust the pole -pieces, a 'revoluble screwthreaded collar fitting the screw-threads on all the pole-piece-adjusting devices and simultaneously adjusting all the pole-pieces relatively to the armature, and supplemental means coupling all of the adjusting devices together and comprising a ring fastened to said adjusting devices.

S. In a multipolar electric motor or like aplOO IIO

paratus, the combination, With the frame, the armature, and a series of radially-adjustable pole-pieces each having inclined walls, of a corresponding series of adjusters each having inclined faces acting on the inclined Walls of its corresponding pole-piece, and mechanism moving all the adjusters in unison and simultaneously adjusting all the pole-pieces relatively to the armature, substantially as described.

9. In a multipolar electric motor or like apparatus, the combination, with the frame, the armature, and a series of radially-adjustable pole-pieces each having inclined Walls, of a corresponding series of adjusters each having inclined faces acting on the inclined Walls of its corresponding pole-piece, and mechanism moving all the adjusters in unison and simultaneously adjusting all the pole-pieces relatively to the armature; said mechanism comprising a revoluble screw-threaded collar fitting screw-threads on all the pole-piece adjusters, substantially as described.

10. In a multipolar electric motor orlike apparatus, the combination, with the frame, the armature, and a series of radially-adjustable pole-pieces each having inclined Walls, of a corresponding series of adjnsters each having inclined faces acting on the inclined Walls of its corresponding pole-piece, mechanism moving all the adjusters in unison and sim ultaneously adjusting all the pole-pieces relatively to the armature, and supplemental means coupling all the adjuster-s together, substantially as described.

11. In a multipolar electric inotor or like apparatus, the combination, With the frame, the armature, and a series of radially-adjustable pole-pieces each having inclined walls, of a corresponding series of adjusters'each having inclined faces acting on the inclined Walls of its corresponding pole-piece, mechanism moving all the adjusters in unison and simultaneously ad j ustin gall the pole-pieces relatively to the armature, and supplemental means coupling all the adjusters together and com, prising a ring fastened to the adjusters, substantially as described.

12. In an electric motor or like apparatus, the combination, with the frame having a radial opening 2 and transverse slots 17, 18; and the armature, of a pole-piece having a core 3 movable in opening 2 and provided with slots 7, 8, respectively having inner inclined Wall 9 and outer inclined Wall 10; and an adjuster 13 laterally movable in the frame-slots 17, 18

and provided with tongues 14, 15, respectively having inner inclined face 19 and outer inclined face 2O acting on the respective inclined core-Walls 9, 10, for adjusting the polepiece relatively to the armature, substantially as described.

13. In an electric motor or like apparatus, the combination, with the frame having a series of radial openings 2 and transverse slots 17, 18 next said openings; and the armature, of a series of pole-pieces each having a core 3 movable in one of the frame-openings 2 and provided with slots 7, 8, respectively having inner inclined Wall 9 and outer inclined wall 10; and a series of corresponding adjusters 13 one moving in the slots 17, 18 at each frameopening 2, and each adjuster having tongues 14, 15, respectively having inner inclined face 19 and outer inclined face 2O acting on the respective inclined core-Walls 9, 10, each adjuster also having a screw-thread 21; and a collar 22 having a screw-thread fitting the threads 21 of,all the adjusters 18 and held revolubly to the frame and adapted to simultaneously move all the adjusters and thereby uniformly set all the pole-pieces relatively to the armature, substantially as described.

14. In an electric motor or like apparatus, the combination, with the frame havingaseries of radial openings 2 and transverse slots 17, 18 next said openings; and the armature, of a series of pole-pieces each having a core 3 movable in one of the frame-openings 2 and provided With slots 7, 8, respectively having inner inclined Wall 9 and outer inclined wall 10; and a series of corresponding adjusters 18 one moving in the slots 17, 18 at each frameopening 2, and each adjuster having tongues 14, 15, respectively having inclined face 19 and outer inclined face 2O acting on the respective inclined core-walls 9, 10, each adjuster also having a screw-thread 21; a collar 22 having a screw-thread fitting the threads 2l of all the adjusters 13 and held revolubly to the frame and adapted to simultaneously move all the adjusters and thereby uniformly set all the pole-pieces relatively to the armature, and a ring 29 fastened to all the adjusters, substantially as described.

In testimony whereof I have hereunto subscribed my name and affixed myseal this 19th day 0f December, A. D. 1902.

WALTER V. ASH. [L. s]

Witnesses:

CHARLES W. THIoIs'rUN, H. 0. BISHOP.

IOO 

